CONSTANT CUTTENT BOOST CONTROLLER FOR DRIVING HIGH POWER LEDS
DESCRIPTION
The UTC L5107 is a high powered PWM boost converter
optimized for constant current applications such as driving one or
more strings of high power LEDs. The powerful drive circuitry can
deliver up to 70W to the LED system.
The output current can be set by an external resistor
connected the IADJ pin and GND. This average current can be
reduced by applying a PWM signal to the PWMD pin. The UTC
L5107 offers a dither feature to reduce EMI.
The UTC L5107 has a large input voltage range from 6V to
45V and the switching frequency can be set by an external
resistor between 100kHz and 1MHz for diffident LED systems. To
protect the device over voltage protection circuit and under
voltage lock-out circuit have been incorporated as well as thermal
shutdown circuit.
The UTC L5107 is available in the HTSSOP 16-pin TSSOP package.
FEATURES
* Input voltage range: 6V~45V
* Feedback voltage: 0.25V±3%
* Maximum out power of 70W
* Programmable switching frequency and LED drive current
* Ultra low EMI via dithering on the UTC L5107
* Single pin for PWM dimming
* Protection circuit:
Over voltage protection circuit
Over temperature protection circuit
Under-voltage Lock-out circuit
* Accurate over the -40~125°C temperature range |
